[Swan] Usage of firewall marks by KLIPS/OpenSwan/Libreswan

Lawrence Manning lawrence.manning at smoothwall.net
Tue Feb 3 19:33:38 EET 2015

Hi there,

We are currently (still) using openswan, but will shortly be migrating over
to libreswan. I suspect this question is generic and relevant to both, so
I'm sending it to this list.

We make use of firewall marks quite extensively, more so as time has gone
by, and now we have issues whereby KLIPS is asserting its own marks. This
is proving to be a real problem, since marks are used for critical things
like policy routing etc.

1. What functionality does the usage of these marks give KLIPS?
2. If it is minor, is it possible to disable this functionality either at
configure time or compile time?
3. I notice that there is a kernel patch:
(0001-SAREF-add-support-for-SA-selection-through-sendmsg.patch) which
appears to move the useage of marks to a dedicated field in the sockbuf. Is
applying this patch to our kernel tree, enabling the new option and
rebuilding swan/klips enough to stop KLIPS from using firewall marks?



Lawrence Manning
Founder & Developer

lawrence.manning at smoothwall.com

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